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UK weather: Why was it so warm on Saturday night? | UK weather: Why was it so warm on Saturday night? |
(about 1 hour later) | |
Temperatures reached 16.8C in northern Scotland overnight - the highest ever recorded for the UK this late in the year. | Temperatures reached 16.8C in northern Scotland overnight - the highest ever recorded for the UK this late in the year. |
The figure, recorded by the Met Office, in Cassley, Sutherland at 03:00 GMT on Sunday, is the highest on record for 29, 30 or 31 December. | The figure, recorded by the Met Office, in Cassley, Sutherland at 03:00 GMT on Sunday, is the highest on record for 29, 30 or 31 December. |
Northern Wales and north-east England were also unseasonably warm. | Northern Wales and north-east England were also unseasonably warm. |
Forecasters said the "remarkable" overnight temperatures were down to a phenomenon called the Foehn Effect. | Forecasters said the "remarkable" overnight temperatures were down to a phenomenon called the Foehn Effect. |
This pattern develops in mountainous regions, such as the Scottish Highlands, and results in wet and cold conditions on one side of a mountain and warmer and drier conditions on the other. | |
It occurs when moisture-laden, high humidity air is pushed over high ground by strong winds. As it rises, the air cools and condenses, forming cloud and rain. | |
Dry air then travels down the other side of the mountain, picking up heat as it goes and resulting in higher temperatures at ground level. | |
In the UK, this effect is commonly seen in eastern Scotland, north-east Wales and north-east England. | In the UK, this effect is commonly seen in eastern Scotland, north-east Wales and north-east England. |
Other parts of the UK also saw unusually high temperatures overnight. For example, temperatures of 13.3C were recorded in Chillingham Barns, Northumberland and 11.5C in Rhyl, north Wales. | Other parts of the UK also saw unusually high temperatures overnight. For example, temperatures of 13.3C were recorded in Chillingham Barns, Northumberland and 11.5C in Rhyl, north Wales. |
Alex Burkill, a meteorologist for the Met Office, said it was highly unusual to reach such high temperatures overnight in December. | Alex Burkill, a meteorologist for the Met Office, said it was highly unusual to reach such high temperatures overnight in December. |
"Getting temperatures of 16 or 17 degrees in December isn't all that unusual but it's remarkable that this was during the night," he told the BBC. | "Getting temperatures of 16 or 17 degrees in December isn't all that unusual but it's remarkable that this was during the night," he told the BBC. |
The current record for the highest daily maximum temperature in December in the UK is 18.3C, recorded in Achnashellach in the Scottish Highlands on 2 December 1948. However, this was recorded during the day. | The current record for the highest daily maximum temperature in December in the UK is 18.3C, recorded in Achnashellach in the Scottish Highlands on 2 December 1948. However, this was recorded during the day. |
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